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CVE-2026-82727— AshPhoenix Form.Auto leaks submitted params in an unknown _union_type error message

Quick assessment

Affected
ash-project ash_phoenix
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Ash Framework ash phoenix是Ash Framework组织的一个声明式应用开发框架。 Ash Framework ash phoenix 1.2.17版本至2.3.25之前版本存在信息泄露漏洞，该漏洞源于将完整原始提交参数映射写入异常消息，导致敏感信息泄露，攻击者可利用该漏洞将密码等机密信息泄露至日志、崩溃报告和开发错误页面。

CVSS 2.3 · Low EPSS 0.47% · P39

Affected Version Matrix 2

VendorProduct Version RangeStatus
ash-project ash_phoenix 1.2.17< 2.3.25 affected
a3436fcc321e3b34c242cceaf62c3c92bc1a452b< 0c1775c3cf8988f9abd10a8f92315afc5f06f16d affected
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I. Basic Information for CVE-2026-82727

Vulnerability Information
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Vulnerability Title
AshPhoenix Form.Auto leaks submitted params in an unknown _union_type error message
Source: CVE Program / CVE List V5
Vulnerability Description
Generation of Error Message Containing Sensitive Information vulnerability in ash-project ash_phoenix writes the entire raw submitted param map into an exception message, so secrets submitted alongside a union form field leak into logs, crash reports and the dev error page. When AshPhoenix.Form.Auto builds a union sub-form and the submitted _union_type does not match a configured type, both raise sites built the message with inspect(params, pretty: true), embedding the full untrusted param map, and also inspected the internal union constraints[:types]. Because the message is constructed by the library rather than Phoenix's parameter logger, config :phoenix, :filter_parameters never redacts it. An attacker controls both the trigger and the contents: submitting %{"_union_type" => "nope", "password" => "..."} puts the password verbatim in the raised message. The fix reports only the offending _union_type and the valid type names, dropping the param and constraints dumps. This issue affects ash_phoenix: from 1.2.17 before 2.3.25.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过错误消息导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Ash Framework ash phoenix 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Ash Framework ash phoenix是Ash Framework组织的一个声明式应用开发框架。 Ash Framework ash phoenix 1.2.17版本至2.3.25之前版本存在信息泄露漏洞，该漏洞源于将完整原始提交参数映射写入异常消息，导致敏感信息泄露，攻击者可利用该漏洞将密码等机密信息泄露至日志、崩溃报告和开发错误页面。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ash-project ash_phoenix 1.2.17 ~ 2.3.25 cpe:2.3:a:ash-project:ash_phoenix:*:*:*:*:*:*:*:*
ash-project ash_phoenix a3436fcc321e3b34c242cceaf62c3c92bc1a452b ~ 0c1775c3cf8988f9abd10a8f92315afc5f06f16d cpe:2.3:a:ash-project:ash_phoenix:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-82727

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III. Intelligence Information for CVE-2026-82727

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Patches & Fixes for CVE-2026-82727 (1)

Other References for CVE-2026-82727 (3)

Same Patch Batch · ash-project · 2026-08-31 · 17 CVEs total

CVE-2026-77956 8.9 HIGH EEx template evaluation of prompt content in AshAi enables remote code execution
CVE-2026-77850 8.4 HIGH Stored XSS in AshAdmin relationship typeahead via unescaped label_field content
CVE-2026-75757 8.3 HIGH AshAdmin cookie reader matches names by substring, enabling actor/session shadowing from a
CVE-2026-82722 8.3 HIGH AshAdmin LiveView events intern atoms from client input, exhausting the atom table (node D
CVE-2026-82673 8.3 HIGH Path traversal in AshAdmin file uploads via unsanitized client filename
CVE-2026-82724 7.6 HIGH Broken access control in AshPhoenix SubdomainHook via a nil tenant in handle_subdomain
CVE-2026-81315 7.4 HIGH MCP DNS-rebinding origin check in AshAi is bypassed by a spoofed X-Forwarded-Proto header
CVE-2026-75760 7.1 HIGH AshAi vectorize change leaks raw embedding-provider errors, including credentials, in a us
CVE-2026-82564 7.1 HIGH Identity tool filter in AshAi accepts operator maps, allowing update or destroy of unident
CVE-2026-82726 6.3 MEDIUM AshPhoenix get_subdomain maps a crafted or differently-cased Host header to an arbitrary t
CVE-2026-82579 6.0 MEDIUM AshAi tool loop never terminates when all tool calls are filtered out, enabling denial of
CVE-2026-82580 5.3 MEDIUM AshAi echoes raw tool exception messages into the conversation, disclosing internal detail
CVE-2026-81853 2.3 LOW AshAdmin composite primary key decoding accepts arbitrary fields, enabling a secret-attrib
CVE-2026-82725 2.3 LOW AshPhoenix FilterForm allows filtering across non-public relationships, disclosing private
CVE-2026-81852 2.1 LOW AshAdmin ships a hardcoded CSP nonce, allowing nonce-based CSP bypass
CVE-2026-82681 2.0 LOW Query-parameter injection in AshAdmin row-action links via unencoded string primary keys

IV. Related Vulnerabilities

Same product: ash_phoenix
Same vendor: ash-project
Same weakness: CWE-209

V. Comments for CVE-2026-82727

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